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Thread: Sketchup question

  1. #1

    Sketchup question

    I'm curious if there is a function to determine volume of an object. For Example, if I draw a 12" square and pull it up 12" I get a 1 cu.ft cube. Then if I cut, say a 6" dia. hole through the cube, how do I determine the volume of the cube after the hold is made? I could figure the volume of the cube less the volume of the hole, easy enough but my pea brain stops right about there. If I continue to add or subtract things, say I truncate one of the corners I'm pretty much lost with volume.

    Below is a pic of a speaker cabinet I build. I'm trying to model it in Sketchup and establish internal volume based on what size I model it at. Any ideas?

    Thanks
    Chris
    Attached Images Attached Images

  2. #2
    A ruby script may work, if you can install it and make it work.

    Try:
    http://www.crai.archi.fr/RubyLibrary...n_geo_page.htm

  3. #3

    volume stuff

    You have it right volume of a cube - volume of cylinder
    volume of a cube = L*W*H, volume of a cylinder = (pi) r^2 h, this will work when you use a cylinder speaker
    (I would suggest a calculator for this)
    If you use a regular speaker it will be conical in shape.
    Letter variable explanation
    h1 = imaginary portion of cone
    h = height of known portion of cone (rim to back of magnet)
    r = radius of magnet
    R = radius of rim

    This is the equation for a cone with a missing portion
    V= (1/3)(pi)R^2(h1+h) - (1/3)(pi)r^2h1

    In order to do this you must first set up a ratio and solve to get h1, it is
    h1 = h1=h
    r R
    then simply plug h1 into the formula given

    If you really get specific you must compensate for all of the triangle portions of the box and the thickness of the wood, and to do that you need to visualize basic geometric shapes in the box. The cube and the elongated triangles. But in this case I don't think that it will make too much of a difference.

    Also check this site out it might have some useful info to it.
    http://www.mobileinformationlabs.com...Volum_1%20.htm
    Last edited by Jesse Kerr; 01-17-2008 at 12:52 PM. Reason: incorrect ratio letter placement

  4. #4
    ratio will not come up right so here it is
    (h1/r)= (h1+h)/R

  5. #5
    Join Date
    Oct 2006
    Location
    Mazon, Il
    Posts
    375
    Just came across this:

    http://www.crai.archi.fr/RubyLibrary...m_fil_page.htm

    Look for:
    VolumeCalculator21.rb

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